Quantitative Aptitude Ques 868

Question: If $ {{(2000)}^{10}}=1.024\times 10^{k}, $ then the value of k is

Options:

A) 33

B) 30

C) 34

D) 31

Show Answer

Answer:

Correct Answer: A

Solution:

  • $ {{(2000)}^{10}}=1.024\times 10^{k} $

$ \Rightarrow $ $ {{(2\times 1000)}^{10}}=\frac{1024}{1000}\times 10^{k} $

$ \Rightarrow $ $ 2^{10}\times {{(10^{3})}^{10}}=\frac{2^{10}}{10^{3}}\times 10^{k} $

$ \Rightarrow $ $ 2^{10}\times 10^{30}=2^{10}\times {10^{k-3}} $

$ \Rightarrow $ $ 30=k-3 $

$ \Rightarrow $ $ k=33 $